SOUND circuits is based on Panasonic MN3008 bucket brigade chips, a few supply were available so the 104Z is considered as a limited edition.
All delay and modulation functions are really easy and sound routing is flexible and experimentation is quite obligatory using the control CV or modular system: the feedback loop is great for infinite feedback saturations.

MEMORY delay time range from 50 ms to a max of 1000 ms of delay.

The dedicated tab switches range between 2 memory modes:1-
SHORT range from 50 to 500 ms2-
LONG range from 100 ms to 1 second.

PANEL potentiometers functions in detail: - DRIVE is the input gain, it accepts variety of instruments from synth to guitar
- DELAY TIME adjusts the delay time range- MIX adjust balancing between dry / wet- FEEDBACK adjusts amount of a delayed signal sent back to internal processor or routed to external loop path- OUT the overall output volume gain- LOOP GAIN adjust the amount of signal sent to LOOP IN, the signal path instead of going back to internal processor will be routed to external loop circuit and back again thru another unit of your choice.

MODIFICATION the Moog factory sells a custom modification called spillover mod that Bypasses the delay without killing existing echoes. This mod applies also to other models like Mf104, Mf-104d, while mf-104M and super delay are already modded.
Note: there is no official schematics available, instead you have to send your unit to the factory in USA (price: 99$)

REVIEW: "it's a Moog: well-made and good analog delay based on bucked brigade BBD. Love the sound especially the feedback loop but the price is unjustified. The sound as you can expect is warm and round contrary to common digital, although is has typical minor tonal degradations on the delayed sound. "